Regulating device for central heating installations



. v 1,656,525 E. J. LEWINSKY ET AL V REGULATING DEVICE FOR CENTRALHEATING INSTALLATIONS Jan. 17, 1928.

' Filed April 6, 1926 Patented Jan. 17, 1923.

. UNITED STATES 1,t-5fi,525

PATENT OFFICE.

ERIK JULIUS LEYVINSKY AND ANDERS VILHELM VIGGO LEWINSKY, 013 COPENHAGEN,DENMARK.

REGULATING DEVICE FOR CENTRAL HEATING INSTALLATIONS.

Application filed April 6, 1526, Serial No. 100,194, and in DenmarkNovember 13, 1924.

between the outletand inlet pipes of the boiler, or on the expansion ofa fluid enclosed in a casing.

The regulating pipes or" the first group must be 'ather long, it theirlongitudinal variations by small alterations of temperature shall besuiiiciently large, and during their mounting the heating installationmust be emptied from water, and the arrangements of the second groupcannot be relied upon after the use of some time.

Our invention relates to a. regulating device which is acted upondirectly by the temperature of the boiler water, as the arrangements ofthe former group, and at the same time is placed directly on theboil-er, as the arrangements of the latter group of known regulators.

Our invention is illustrated in the accompanying drawing, in whichFigure 1 shows the regulating device in side-view;

l' ig. Q the same in irontwicw; and

ll 8 the same in vertical section.

Arcoriling to our invention a. pipe ll. placed in oi near the top of theboiler and furnished with a cover 52 havin an air valve 3. The pipe 1surrounds a concentric inner pipe i, the upper part of which does notreach quite up to the cover 2, while its lower end projects with a pieceinto the boiler. The larger this piece is, the more sensitive becomesthe regulating device. Connected to the upper end of the outer pipe 1 isthe upper end 5 of a casing 6. The lower end 7 of easing 6 is open andloosely surrounds the pipe 1.

The lower end 7 of casing 6 has knife-edges 8 directed downward andlodged in a iorlo shaped piece 10 of a lever 9. Under the branches ofthe said fork 10 is afirin plate 11 having upwardly directed knife-edges12, the knife-edges 8 and 12 being displaced from one another. The lever9 further has a downwardly directed knife-edge 13, being displaced withrespect to a knife-edge 15 lodged in an arm 14:, and carried by a rod16, which is connected with the damper or air valve of the fire-place.

Our regulating device acts in the following manner:

By alterations of temperature in the boiler water a circulation in thewater-filled pipe 1, caused by the length of the inner return pipe, willtake place indicated by arrows, and thus the outer pipe will always havethe temperature of the water, and will change its length owing to thealteration of the temperature. The movement caused by this alteration istransmitted to the casing 6, so that the lever 9 will be lifted or sunk,which movement again will bring about a a swinging or": the rod 16, tothe end of which the damper or valve in well-known manner is connectedby means of a chain or the like.

Our device may be made in relatively small dimensions, an alteration ofa millimeter of the lengthot the pipe 1 causing a considerableoscillation of the rod 16, which is counterbalanced in such amanner,that the damper has overweight.

The regulating device can be screwed on water filled boilers of everykind, and no special pipeconnections or other mountings are. needed.

For the knife-edge 13 two notches are furr12, nished in the rod 16, sothat it, by means o't an adjusting screw, can be shifted according tothe connection oil the rod with the damper.

Having thus described our invention, We claim:

In regulating devices for ccntral-hoating installations, in which amember expanding and contracting by alterations of temper ature adjustsa damper for air supply by means of a leverand lniitc-cdgc-connection,3% the combination, with a boiler, of an outer pipe mounted at the topof the boiler and communicating at the lower end with the interior ofthe same, an inner return pipe surrounded by and separated from the saidouter pipe and projecting into the boiler to effect a circulation ofwater through the pipes, a cover placed at the upper end or" the saidouter pipe, a casing surroundingthe said pipes and connected to theouter pipe,

